Camera for photographing the eyeball



May 27, 1930. F. PFEIFFER ET AL 4 CAMERA FOR PHOTOGRAPHING THE EYEBALL Filed March 21. 1928 Fig.2

gm JIVQ/RO/S: 4 M .7424 w Patented May 27, 1930 PATENT OFFIC FRANKLIN PFEIFI'EB AND THEODOR Kl'lHL, O1 J'ENA,

GERMANY, ASSIGNOBS TO THE FIRM CARL ZEISS, OF \TENA, GERMANY CAMERA FOR PHOTOGRAPHING THE EYEBALL Application filed March 21, 1928,

The photographing of the eyeball by which in particular the aspect of the iris is to be fixed has hitherto involved some difficulty because by the reflexion of the laterally dis- 5 posed source of light at the cornea, i. e. by l reflexion the iris was the so-called cornea partly covered, so that only an imperfect image of the same was obtained.

According to the present invention it is possible to render harmless the reflexion of the source of light at the cornea for photographing the iris by isposing on the camera beside the photographic lens a reflecting surface and by throwin the pencil of illuminating rays on this re ecting surface. After a suitable adjustment of the source of light and the mirror the pencil of illuminating rays is transmitted from the reflecting surface to the eye to be photographed approximately parallel to the optical axis of the camera. Also with this direction of incidence of the pencil of illuminating rays there still takes place a corneal reflexion but, if the device 'be properly adjusted relatively to the eye to be photographed, this occurs at a place which is harmless for the photographing of in front of the eye-pupil. If, 'on the other hand, it be desired to photograph just the part of the cornea, lying in front of the pupil of the eye, it is only necessary to set up somewhat laterally the camera with the source of light. In that case the part of the cornea, lying in front of the pupil, remains free from objectionable reflexions.

In order to facilitate the relative adjustment of the source of light, the mirror, the camera and the eye to be photographed, the illuminating device should be rigidly connected to the camera.

If the illumination of the eye be attained by means of a bright surface, which is imaged into the eye. by a projection system, it 45 is possible to entirely remove with the new device the corneal reflexion by disposing on the bright surface a circular stop whose image, produced by the projection system, is thrown upon the eyeball.

60 place at which otherwise the iris, viz,

the corneal reflex- In that case the Serial No. 263,546, and. in Germany April 6, 1927.

itip would take place, is not illuminated at In order to always be able to adjust the camera and the source of light prior to the photographing in such a way that no light, reflected by an undesirable part of the cornea, enters the photographic lens of the camera, the latter is suitably connected with a finder to which appertains a light-entrance mirror, iiisposed in the vicinity of the photographic'oo ens.

The annexed drawing shows as a constructional example a stereoscopic camera according to the invention.

Fig. 1 represents a camera, partly in a sectio on the line 2-2 of Fig. 1 view of a single part.

I The apparatus shown 0 casing a whose front is provided with two photographic lenses 6 and 0. To the casing 11 there is rigidly connected an illuminating device and a finder. The illuminating device contains a glow lamp 6, a condenser f, two prisms g and h as well as a projection lens 11 which produces an image of the aperture of the condenser on the eye to be photographed. Of the prisms g and h the latter is cemented to the lens 71 and disposed between the two photogra hic lenses 6 and 0. so. The finder contains an o jective an ocular is, Z and two prisms m and n of which the latter is again disposed between the two hotographic lenses 6 and 0. On the sur ace, facing the projection lens 2', of the condenser f there is disposed a stop 0 being a black spot (Fi 3) whose image, produced by the lens '5, is t rown into the pupil of the eye to be photographed.

We claim:

1. Camera for photographing the eyeball, comprising a casing, an objective fixed on the casing, a source of light fixed on the casing and a mirror fixed on the casing in the vicinity of the said objective and adapted 96 to transmit light, emerging from the source of light, approximately parallel to the axis of th]: slaid objective to the eye to be photoe Camera for photographing the eyeball, 100

side elevation of this 65 n, Fig. 2 a section and Fig. 3 a front onsists of a cameracomprising acasing, an objective fixed on the casing, a source of light fixed on the casing, a mirror fixed on the'casing 1n the vicinity of the said objective and adapted to transmit light, emerging from the source of light, approximately parallel to the axis of the said objective to the eye to be photographed, and two collective lens systems lying between the source of ed to image the source of light approximately at the locus of the second system, and this second system being adapted to image the first one on the eye to be examined.

In a camera according to claim 2, a stop disposed in the middle of the said first collective system.

4. Camera for photographing the eyeball, comprising a casing, the casing, a source of light attached to the casing, a mirror fixed on the casing in the vicinity of the said objective and adapted to transmit light, emerging from the source of light, approximately parallel to the axis of the said objective to the eye to be photographed, and a finder fixed on the casing and having its look-out aperture in the vicinity of the said objective.

5. Camera for photographing the eyeball, comprising a casing, an objective fixed on the casing, a source of light attached to the easing, a mirror fixed on the casing in the vicinity of the said objective and adapted to transmit light, emerging from the source of light, approximately parallel to the axis of the said objective to the eye to be photographed, and a finder fixed on the casing, this finder comprising a telescope and a prism system, adapted to deflect the traversing luminous rays, the look-out aperture of the finder lying in the vicinity of the said objective.

6. Stereoscopic camera for photographing the eyeball, comprising a casing, two objectives fixed adjacent to each other on the casing, a source of light attached to the casing, and a mirror fixed on the casing in the plane,

parallel to the axis of the eye to be photoadapted to transmit light, emerging from a source of light, approximately parallel to the axis of the said objective to the eye to be photographed, and a finder fixed on the casing and having its look-out aperture in the said plane in the vicinity of the objectives.

light and the said mirror, the first of these systems being adaptan objective fixed on 8. Stereoscopic camera for photographing the eyeball comprising a casing, two objectives fixed adjacent to each other on the easing, a source of light attached to the casing, a mirror fixed on the casing in the plane, traversing between the said objectives in the vicinity of these objectives and adapted to transmit light, emerging from a source of light, approximately parallel to the axis of the said objective to the eye to be photographed, and afinder fixed on the casing, this finder containing a telescope and a prism system, adapted to deflect the traversing luminous rays, the look-out aperture of the finder lying in the said plane in the vicinity of the objectives.

FRANKLIN PFEIFFER.

THEODOR KT ITHL. 

